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NSI > NVD Manual > Flashcards

NVD Manual Flashcards

1
Q

Describe Microchannel Plate:
Thickness:
How many glass tubes & tilt:
1 electron enters _____ exit

A

1mm thick
>6 million tubes
1 electron enters and 1000 exit

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2
Q

Describe phosphor screen

A

Converts electronic beam energy to light.
Attracts negatively charged electrons exiting MCP
P43 phosphor
Phosphor is toxic

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3
Q

Describe Photocathode

A 
Gallium arsenide (GaAs)
10,000 hour service life
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4
Q

What are the 2 automatic protection features?

A

Automatic Brightness control (ABC)

Bright Source Protection (BSP)

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5
Q

Describe Automatic Brightness Control

A

Maintains image brightness
Gain up or down according to light level
Full moon to starlight
Scintillation occurs below starlight

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6
Q

Describe Bright Source Protection

A

Limits number of electrons leaving photocathode

Automatically shuts down I2 with high light level

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7
Q

Quick don helmet mount

Low battery LED lights at _____
Crash break away at _______

A

2.2-2.0 volts

10-15 Gs

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8
Q

What are the 2 power sources

A

Clip on battery

Low profile battery pack, 2 1.5 V alkaline batteries per compartment

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9
Q

What are LIFs?

A

Light interference filter
Protects NVGs, not eye, from LASER damage.
Used at discretion of CO

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10
Q

Define Luminance and Illuminance.

A

Illuminance is light from a source. Illuminance is reflected light.

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11
Q

Define Radiance and Irradiance

A

Irradiance is heat from a source. Radiance is reflected thermal energy.

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12
Q

Define albedo

A

Amount of reflected light measured in varying degrees.

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13
Q

Define contrast

A

Difference in albedo between objects

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14
Q

What are the 7 sources of night sky illumination?

A 
Moon
Airflow
Starlight
Auroras
Gegenscheins
Zodiac Lights
Noctilucent clouds
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15
Q

What are the 4 phases in Lunar Cycle

A

New moon
Waxing Quarter
Full moon
Waning moon

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16
Q

What can we use to overcome shadowing?

A

FLIR

17
Q

Define the twilights

A

Civil - 0-6 deg
Nautical- 6-12 deg
Astronomical- 12- other side of planet

18
Q

What are the 5 sources of artificial light?

A 
Cultural Lighting
Near IR LASER
Weapon effects
Aircraft external lighting
Battlefield illumination
19
Q

T/F.

Artificial Illumination is authorized to raise illumination levels.

A

False

20
Q

What is the only approved means of determining illumination levels?

A

SLAP data
Solar/lunar almanac predictions.

Does not account for weather, moon angle, shadowing, terrain albedo.

21
Q

FOV with AN/AVS-9R is a maximum of

A

40 def

22
Q

2 authorized methods for adjustments

A

NVG eye lane

ANV-20/20 NVD Infinity focus device (Hoffman box)

23
Q

Focal Range is adjustable from ___ to _____________

A

41 cm to optical infinity

24
Q

Order of adjustment procedures?

A

Vertical and tilt
IPD (interpupillary distance)
Focal Range
Focusing (outer inner outer)

25
Q

Corrective lenses

A

Not necessary because NVGs adjust for correction.

Will not correct for astigmatisms.

26
Q

What are 4 monocular cues

A

Relative size and height
Overlapping objects
Converging parallel lines
Motion parallax

27
Q

Define minification

A

Reduced TV image of an object.

Object seems farther away than it is.

28
Q

Three types of fatigue

A

Acute
Cumulative
Circadian

29
Q

Visible spectrum micron window?

A

.4 - .7

30
Q

Near IR micron window?

A

.7 - 3

31
Q

Mid IR micron window?

A

3 - 5

32
Q

Far IR micron window?

A

8 - 14

33
Q

Capability of any object to emit thermal energy

A

Emissivity

34
Q

Define a blackbody

A

A perfect absorber and emitter is radiant energy. No incident radiation is reflected or transmitted from a blackbody.

35
Q

The ability of an object to store heat is called:

A

Thermal mass

36
Q

The rate that objects change temperature is called:

A

Thermal inertia

37
Q

High thermal inertia means object heats/cools ________

A

Slowly

NSI (1 decks)

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